Aliyah and Shawna are selling cookie dough for a school fundraiser. Customers can buy packages of white chocolate chip cookie dough and packages of gingerbread cookie dough. Aliyah sold 3 packages of white chocolate chip cookie dough and 9 packages of gingerbread cookie dough for a total of $135. Shawna sold 3 packages of white chocolate chip cookie dough and 5 packages of gingerbread cookie dough for a total of $83. Find the cost each of one package of white chocolate chip cookie dough and one package of gingerbread cookie dough.

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?